102 Prof. M'liitosli's Nutes.from the 



From the dorsal surface of the third segment eight some- 

 what stiff branchiae project forward. They are proportionally 

 larger than in SahelUdcs borealis and more finely tapered. 



The body is small and slender, a little more than halt' au 

 inch in length, scarcely tapered anteriorly, with the excep- 

 tion of the short cone of the snout, and very gently tapered 

 posteriori}^ till near the tip, when more rapid diminution 

 occurs to the vent, on each side of which is a slender cirrus. 



So far as can be observed, fourteen bristled segments 

 occur anteriorly, distinguished by the absence of the long 

 cirrus which occurs in the sixteen posterior segments. 

 The bristles are short and translucent, with slightly curved, 

 winged, and tapering tips, and they are bonie on a prominent 

 seti serous process. 



The anterior hooks have a rounded crown, the curve 

 smoothly running into the convex dorsal (or posterior) 

 outline, and the four teeth are characteristic, that next the 

 crown being the largest and the second, third, and fourth 

 regulariy diminishing. Tiie prow curves rather far forward 

 and the tij) is somewhat small. 



The posterior hooks are prominently situated on the edge 

 of tlie fillet, and are free distally, a space separating the 

 one from the other. They are very minute, and diti'er from 

 the antei'ior in the sinuous curve of tlie crown and the 

 slightly broader prow. They have, however, only four teeth, 

 as in front. The hooks in the var. mediterraneu, of De St. 

 Joseph, unfortunately, are so indistinct in the figure that 

 little can be said about them, except that they have four 

 teeth in lateral view, a single row occurring in the thoracic 

 forms and a treble row in the abdominal. 



The tube is a slender one to suit the small size of the 

 specieSj and coated Avilh mud and lined by secretion. 



The fourth form is Samytha sex'cirrata, Sars, chiefly from 

 Zctlandic waters. In this the head (prostomium) forms a 

 somewhat broad anterior central procc>s with a peristoniial 

 buttress on eacii side. Beneath is the flap bearing ventrally 

 the buccal tentacles, which are smooth and somewiuit 

 enlarged distally. Tlie posterior lip is prominent, and passes 

 upward at eacli side as a process se[)aratcd from the cephalic 

 border by a notch. \Vhen viewed laterally, it forms a i)ro- 

 jecting spout-shaped frill. The segment behind the buccal 

 lias no processes. The third and fourth segments carry 

 dorsally the branchiaj, which are three on each side and 

 coni[)aratively long tapering (subulate) organs. In the 



